webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");

const developmentConfig = {
	mode: "development",
	entry: "./dev/index.js",
	output: {
		path: path.resolve(__dirname, "public")
	},
	module: {
		rules: [
			{
				test: /\.js$/,
				loader: "source-map-loader",
				enforce: "pre"
			},
			{
				test: /\.jsx?$/,
				exclude: /node_modules/,
				loader: "babel-loader"
			},
			{
				test: /\.css$/,
				loader: ["style-loader", "css-loader"]
			}
		]
	},
	plugins: [new HtmlWebpackPlugin()],
	devtool: "eval-source-map"
};

const productionConfig = {
	mode: "production",
	module: {
		rules: [
			{
				test: /\.jsx?$/,
				loader: "babel-loader"
			}
		]
	},
	plugins: [new UglifyJsPlugin()],
	devtool: "source-map"
};

module.exports =
	process.env.NODE_ENV === "production"
		? productionConfig
		: developmentConfig;